IEC 61850

ENGINEERING PROCESS

IN

OFFSHORE WIND FARMS

Saeed Nemati27 September 2017

IEC 61850 in Offshore Wind Farms

IEC 61850

2

About Dong Energy

▪ Main Business Units

▪ Headquartered in Denmark

▪ Market Leader in Offshore Wind Power

– 3.8 GW in operation

– 3.6 GW under construction

Bioenergy & Thermal Power Distribution & Customer Solutions Wind Power

SCADA

3 IEC 61850 in Offshore Wind Farms

Ju

ne

20

17

4

DONG Energyactivities

Offshore Wind Farm

5 IEC 61850 in Offshore Wind Farms

▪ Different components: Bay Controller Units, Protection Relays, RTUs, SCADA Servers

▪ Multi Vendor Multi Edition

▪ Between Substations: Onshore Substation and Offshore Substation(s)

▪ Between different entities: Generating System Owner and Offshore Transmission System Owner

▪ Foundation of Communication: Optical Fibres in Export cables and Line of Sight (as backup)

IEC61850 in Dong Energy Offshore Wind Farms – Part 1

6 IEC 61850 in Offshore Wind Farms

Ref.: ABB.com

▪ GOOSE applications

– Only for Non-critical processes e.g.

· Circuit Breaker Failure Protection

· Cascade Tripping

· Operational Tripping System

· Fault Recorder Initiation

· CB Close Lockout

▪ WHY only non-critical?

– Proven reliability by hardwire signals

– Less dependent on O&M skills/knowledge

IEC61850 in Dong Energy Offshore Wind Farms – Part 2

7 IEC 61850 in Offshore Wind Farms

▪ Two entities: Generating System Owner (GEN) and Offshore

Transmission System Owner (OFTO)

▪ Requires two separate Substation Automation Systems (SAS) and

two separate networks

▪ Means no GOOSE between OFTO and GEN or

Using special switches/gateways to communicate ONLY GOOSE

Design Issues – Two Entities in One Substation

8 IEC 61850 in Offshore Wind Farms

– Two or more substations in each wind

farm

– Requires two or more SAS because

· Independency between substations

· Possibility for different divestment

scenarios in future

– Results in two or more separate networks

between substations

– Means no GOOSE between substations

or using Routable GOOSE

Design Issues – One system covering several Substations

9 IEC 61850 in Offshore Wind Farms

▪ Preferred architecture is the combination of all

Design Issues – Network Architecture: RSTP, HSR or PRP

10 IEC 61850 in Offshore Wind Farms

RSTP

HSR 1

IED

Redbox

HSR 2

Switch

RSTP

ServerLAN A

LAN B

▪ Remote connection or Web client

▪ Cyber security requirements

– DMZ

– Jump Host

– VPN

– User Management

– …

Design Issues – Remote Monitoring

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▪ Making a System Specification (=.SSD file) in text format

▪ Procurement

▪ Detail design in IED level and producing .IID files

▪ Integrating the IEDs in SAS using .IID files and a signal

list

▪ Integration tests at one of the suppliers’ factory

▪ Modifications based on .IID files

Design Issues – Engineering Process

12 IEC 61850 in Offshore Wind Farms

Ref.: IEC 61850 - 6

▪ Advantage

– Possibility of late design freeze

– More flexibility to work in parallel

– No need for deep in-house knowledge

– best practice (so far)

▪ Disadvantage

– Higher probability for Interoperability problems

– Specification in high level and not deep in details,

– more dependency on vendors engineering knowledge,

– more efforts in the interface management

▪ More freedom for Vendors!

Design Issues – Engineering Process (Bottom-Up Approach)

13 IEC 61850 in Offshore Wind Farms

▪ Advantage

– Lower probability for Interoperability problems

– Specification in details,

– Vendor independent engineering

– Easier interface management

– Easier information exchange between projects

▪ Disadvantage

– Lack of knowledge in vendors execution team

– Deeper in-house knowledge is required (both in execution team and O&M team)

– Immaturity in the market to understand the standard

Design Issues – Engineering Process (Top-Down Approach)

14 IEC 61850 in Offshore Wind Farms

▪ More training for vendors project teams

– To understand the standard

– To use the standard properly (e.g. right LNs instead of GGIO)

– To accept .SCD file as input

▪ More training for O&M teams

– To understand the standard

– To understand the alarms

– To be able to conduct a proper service and maintenance

The Way Forward…

15 IEC 61850 in Offshore Wind Farms